/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.phoenix.parse;

import java.sql.SQLException;
import java.util.Collections;
import java.util.List;
import org.apache.phoenix.compile.ColumnResolver;
import org.apache.phoenix.exception.SQLExceptionCode;
import org.apache.phoenix.exception.SQLExceptionInfo;

/**
 * Node representing the IN literal list expression in SQL
 * @since 0.1
 */
public class InListParseNode extends CompoundParseNode {
  private final boolean negate;

  InListParseNode(List<ParseNode> children, boolean negate) {
    super(children);
    // All values in the IN must be constant. First child is the LHS
    for (int i = 1; i < children.size(); i++) {
      ParseNode child = children.get(i);
      if (!child.isStateless()) {
        throw new ParseException(
          new SQLExceptionInfo.Builder(SQLExceptionCode.VALUE_IN_LIST_NOT_CONSTANT).build()
            .buildException());
      }
    }
    this.negate = negate;
  }

  public boolean isNegate() {
    return negate;
  }

  @Override
  public <T> T accept(ParseNodeVisitor<T> visitor) throws SQLException {
    List<T> l = Collections.emptyList();
    if (visitor.visitEnter(this)) {
      l = acceptChildren(visitor);
    }
    return visitor.visitLeave(this, l);
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = super.hashCode();
    result = prime * result + (negate ? 1231 : 1237);
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) return true;
    if (!super.equals(obj)) return false;
    if (getClass() != obj.getClass()) return false;
    InListParseNode other = (InListParseNode) obj;
    if (negate != other.negate) return false;
    return true;
  }

  @Override
  public void toSQL(ColumnResolver resolver, StringBuilder buf) {
    List<ParseNode> children = getChildren();
    children.get(0).toSQL(resolver, buf);
    buf.append(' ');
    if (negate) buf.append("NOT ");
    buf.append("IN");
    buf.append('(');
    if (children.size() > 1) {
      for (int i = 1; i < children.size(); i++) {
        children.get(i).toSQL(resolver, buf);
        buf.append(',');
      }
      buf.setLength(buf.length() - 1);
    }
    buf.append(')');
  }
}
